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Journeyman Plumber Exam

Backflow prevention: practice questions

Our Journeyman Plumber bank has 8 questions on this topic. Here are 3 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

What is required on hose bibbs (outdoor faucets) to prevent backflow?

  1. A hose connection vacuum breaker
  2. A water hammer arrestor
  3. A pressure-reducing valve at the meter
  4. Nothing
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A. A hose connection vacuum breaker — Hoses can be left in contaminated water.

Question 2

Which device protects against both backpressure and backsiphonage for high-hazard connections?

  1. An atmospheric vacuum breaker installed on the riser
  2. A reduced pressure principle assembly (RPZ)
  3. A single check valve
  4. A hose bibb vacuum breaker
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B. A reduced pressure principle assembly (RPZ) — RPZs need regular testing.

Question 3

What is a cross-connection?

  1. A wye fitting
  2. A connection between two cold water lines in the same building's supply
  3. A connection between potable water and a source of contamination
  4. A vent connection
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C. A connection between potable water and a source of contamination — Cross-connections must be protected or eliminated.

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